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var db = require('../db')
var bdb = require('./bdb')('search')
var STOPWORDS = require('./stopwords')
var wordRegexp = new RegExp("(\W+)");
var wordBoundaryRegexp = new RegExp("\W");
function parse_terms (s) {
return s.toLowerCase().split(wordRegexp).filter((term) => {
if (! term.match(wordBoundaryRegexp)) {
return true
}
return false
})
}
function cmp (a,b){ return (a<b)?-1:(a===b)?0:1 }
function find_term(term) {
var res = bdb.get(term).toString()
// console.log(res)
if (! res.length) return []
var matches = res.split(",").map((s) => {
if (! s.length) return;
var partz = s.split(" ")
return {
thread: parseInt(partz[0]),
comment: parseInt(partz[1]),
file: parseInt(partz[2]),
strength: parseInt(partz[3]) || 1,
}
})
// console.log(matches)
return matches
}
function search (query, start, limit) {
if (!query) return
start = parseInt(start) || 0;
limit = parseInt(limit) || 10;
var scores = {};
var terms = parse_terms(query);
var total
var to_display = limit
var threads = {}
var thread_ids = []
var comment_ids = []
var file_ids = []
var results = []
terms.forEach((term) => {
if (STOPWORDS.has(term)) return;
var results = find_term(term);
if (!results) return;
results.forEach((result) => {
var score = scores[result.thread] = scores[result.thread] || { count: 0, strength: 0 }
score.thread = score.thread || parseInt(result.thread)
score.comment = score.comment || parseInt(result.comment)
score.file = score.file || parseInt(result.file)
score.strength += result.strength
score.count += 1
})
})
total = Object.keys(scores).length
Object.values(scores).sort((b,a) => {
// if (a.count !== b.count) {
// return cmp(a.count, b.count)
// }
return cmp(a.strength, b.strength)
}).some((match, i) => {
if (i < start) return false
if (to_display-- === 0) return true
results.push(match)
// console.log(match)
thread_ids.push(match.thread)
if (match.comment) comment_ids.push(match.comment)
if (match.file) file_ids.push(match.file)
return false
})
return {
meta: {
query: query,
terms: terms,
start: start,
next: start + limit,
limit: limit,
total: total,
},
results: results,
thread_ids: thread_ids,
comment_ids: comment_ids,
file_ids: file_ids,
};
}
module.exports = { search: search }
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